四裂无柱兰 si lie wu zhu lan

Peristylus tetralobus Finet f. basifoliatus Finet, Rev. Gén. Bot. 13: 525. 1901; Orchis basifoliata (Finet) Schlechter.

Plants 10-23 cm tall. Tubers subglobose, 5-10 mm. Stem with 2 tubular sheaths at base, 1-leaved. Leaf basal or cauline, porrect, narrowly oblong-lanceolate, 3.5-7 × 0.5-1.4 cm, apex acute. Peduncle ebracteate; rachis 0.5-3 cm, ± laxly 4- to densely more than 10-flowered; floral bracts ovate-lanceolate, 3-6 mm, shorter than ovary, apex acute to acuminate. Flowers secund, white often tinged pinkish red, with purple spots on lip; ovary and pedicel 6-10 mm. Dorsal sepal erect, ovate-oblong, concave, 3-3.5 × ca. 1.7 mm, 1-veined, apex obtuse; lateral sepals spreading to reflexed, oblong, oblique, 4-4.5 × ca. 2 mm, 1-veined, apex obtuse. Petals connivent with dorsal sepal and forming a hood, rhombic-ovate, 4-4.5 × ca. 2.5 mm, 1-veined, apex acute; lip broadly obovate, 5-7 × 7-9 mm, 3-lobed below middle; lateral lobes oblong, slightly falcate, 3-5 × 2-3 mm, apex irregularly obtuse-toothed; mid-lobe obovate-flabellate, 4-5 × 4-6 mm, base cuneate, apex truncate, irregularly crenulate to shallowly notched to form 2 small lobules, sinus often with a short obtuse tooth; spur pendulous, straight to slightly incurved, cylindric, 2-3 mm, apex obtuse; viscidia ovoid; stigma lobes clavate-oblong. Fl. Jun-Jul.

● Damp places in forests, grassy slopes; 2600-3800 m. SW Sichuan, NE and NW Yunnan.